Bosch CO21 21-piece cobalt drill bit set in a clear plastic case with labeled packaging highlighting features like "Hard Core Cobalt," "4x Life," and "No Skate Tip," suitable for stainless steel and other metals.
Close-up of twist drill bits arranged by size, showcasing the helical flute design and cylindrical shanks used for drilling in metal, wood, and plastic.
Visual icons representing wood, plastic, and metal materials with the heading "Best for," indicating the drill bit set’s compatibility across multiple surfaces.
Bosch CO21 21-piece cobalt drill bit set in a clear plastic case with labeled packaging highlighting features like "Hard Core Cobalt," "4x Life," and "No Skate Tip," suitable for stainless steel and other metals.
Close-up of twist drill bits arranged by size, showcasing the helical flute design and cylindrical shanks used for drilling in metal, wood, and plastic.
Visual icons representing wood, plastic, and metal materials with the heading "Best for," indicating the drill bit set’s compatibility across multiple surfaces.
BOSCH

Bosch CO21 21-Piece Cobalt Drill Bit Set with Durable Case Split-Point Tip Three-Flat Shank for Stainless Steel Cast Iron Titanium Aluminum Wood Plastic

In stock
SKU: CO21
$52.49
Description

Professional-Grade Cobalt Drill Bit Set for Demanding Applications

The Bosch CO21 21-Piece Cobalt Drill Bit Set is engineered for contractors, tradespeople, and DIY enthusiasts who demand precision, durability, and superior performance. Designed to deliver 4X longer life than standard high-speed steel bits, these cobalt drill bits excel in tough materials such as stainless steel, cast iron, titanium, and high-density metals. They also provide reliable results in light-gauge metal, wood, and plastic, making them a versatile addition to any toolbox.

Featuring a split-point tipthree-flat shank design

Key Features

  • Manufactured from cobalt for maximum strength and durability
  • 4X longer life compared to standard high-speed steel drill bits
  • Split-point tip prevents skating and ensures precise starts
  • Three-flat shank design improves grip and reduces slippage
  • Handles high drilling temperatures for superior performance in stainless steel
  • Laser-etched markings for quick and easy bit identification
  • Versatile use across stainless steel, cast iron, titanium, aluminum, wood, and plastic
  • Durable storage case included for organization and portability

What's Included

  • (2) - 1/16" Bits
  • (2) - 5/64" Bits
  • (1) - 3/32" Bit
  • (1) - 7/64" Bit
  • (2) - 1/8" Bits
  • (1) - 9/64" Bit
  • (1) - 5/32" Bit
  • (1) - 11/64" Bit
  • (2) - 3/16" Bits
  • (1) - 13/64" Bit
  • (1) - 7/32" Bit
  • (1) - 15/64" Bit
  • (2) - 1/4" Bits
  • (1) - 5/16" Bit
  • (1) - 3/8" Bit
  • (1) - 1/2" Bit

Specifications

Bit Material Cobalt
Bit Type Twist
Case Included Yes
Pieces 21
Shank Design Three-Flat (on 3/16" and larger)
Tip Style Split-Point
Markings Laser-Etched Diameter
Performance Life 4X Longer Than Standard HSS
Applications Stainless Steel, Cast Iron, Titanium, Aluminum, Wood, Plastic
Temperature Resistance High Drilling Temperatures